Soda consumption has been linked to the increased risk of chronic diseases, diabetes in particular. New research analysis indicates that soda drinkers consume 1 or more cans per day — possibly exposing them to a potential carcinogen. Between 44 and 58% of people over the age of six typically have at least one can of soda per day, possibly more, potentially exposing them to 4-methylimidazole.

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4-methylimidazole (4-MEI) has been recently suggested to be a potential human carcinogen. The chemical is formed during the manufacture of some kinds of caramel color, thus is present in cola beverages. Tyler Smith, from Johns Hopkins University (Maryland, USA), and colleagues estimated exposure to 4-MEI from caramel-colored soft drinks and modeled the potential cancer burden related to routine soft drink consumption levels in the United States.

Public health researchers at Johns Hopkins University have analyzed soda consumption data in order to characterize people’s exposure to a potentially carcinogenic byproduct of some types of caramel color. Caramel color is a common ingredient in colas and other dark soft drinks.

Building on an analysis of 4-MEI concentrations in 11 different soft drinks first published by Consumer Reports in 2014, researchers led by a team at the Johns Hopkins Center for a Livable Future (CLF) estimated exposure to 4-MEI from caramel-colored soft drinks and modeled the potential cancer burden related to routine soft drink consumption levels in the United States.

An Avoidable and Unnecessary Cancer Risk

“Soft drink consumers are being exposed to an avoidable and unnecessary cancer risk from an ingredient that is being added to these beverages simply for aesthetic purposes,” says Keeve Nachman, PhD, senior author of the study and director of the Food Production and Public Health Program at the CLF and an assistant professor at the Johns Hopkins Bloomberg School of Public Health. “This unnecessary exposure poses a threat to public health and raises questions about the continued use of caramel coloring in soda.”

In 2013 and early 2014, Consumer Reports partnered with the CLF to analyze 4-MEI concentrations of 110 soft drink samples purchased from retail stores in California and the New York metropolitan area. This study pairs those results with population beverage consumption data from the National Health and Nutrition Examination Survey (NHANES) in order to estimate the population risks and cancer burden associated with 4-MEI exposures through soda.

While the 2014 study of the 110 samples of soda brands was not large enough to recommend one brand over another or draw conclusions about specific brands, results indicated that levels of 4-MEI could vary substantially across samples, even for the same type of beverage. “For example, for diet colas, certain samples had higher or more variable levels of the compound, while other samples had very low concentrations,” says Tyler Smith, lead author of the study and a program officer with the CLF.

Steps Needed to Protect the Public’s Health

“This new analysis underscores our belief that people consume significant amounts of soda that unnecessarily elevate their risk of cancer over the course of a lifetime,” says Urvashi Rangan, PhD, executive director for Consumer Reports’ Food Safety and Sustainability Center. “We believe beverage makers and the government should take the steps needed to protect public health. California has already taken an important step by setting a threshold for prompting Prop 65 labeling based on daily 4-MEI exposure from a food or beverage, such as a soda. This study sought to answer a critical question: How much soda do American consumers drink on average?”

Researchers also found sharply contrasting levels of 4-MEI in some soft drinks purchased in the New York metropolitan area, versus California. “Our study also found that some of the soft drink products sold in California that we sampled had lower levels of 4-MEI than the samples we looked at of the same beverages sold outside the state, particularly in our earlier rounds of testing. It appears that regulations such as California’s Proposition 65 may be effective at reducing exposure to 4-MEI from soft drinks, and that beverages can be manufactured in ways that produce less 4-MEI,” suggests Nachman. “An FDA intervention, such as determining maximum levels for 4-MEI in beverages, could be a valuable approach to reducing excess cancer risk attributable to 4-MEI exposure in the U.S. population.”

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Elaine Ferguson, MD is a pioneer in the field of integrative and holistic medicine. She’s a graduate of Brown University, Duke University School of Medicine and completed her post-graduate training at the University of Chicago. During her trailblazing career she served as the founding medical director of the nation’s first Independent Practice Association (IPA) of chiropractors to provide primary care in a managed care setting, and practiced at the Cancer Treatment Centers of America. Also, Dr. Ferguson taught mind-body medicine at one of the nation’s first graduate level holistic medicine programs. She is the host of the acclaimed PBS pledge special SuperHealing Secrets currently airing nationwide, and has written several books, including the international bestseller SuperHealing: Engaging Your Mind, Body, and Spirit to Create Optimal Health and Well-Being. As a wellness consultant, and speaker, she’s lectured extensively at conferences, universities and medical schools, consulted with businesses, government agencies, not-for-profits, faith based organizations, and testified on a Congressional alternative medicine panel.

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